I can have music play from the Mac, and HomePod at the same time, and they stay in sync. Just not sure if two or more would work.
It works, but doesn't. I don't have 2 HomePods, but I was able to play multiple AirPlay devices at once, including the HomePod. The HomePod ends up being out of sync because it's playing the song directly. So, technically it works, it's just out of sync and probably will remain so until AirPlay 2 is released.
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My Apple hardware's all on a Developer versions (Apple TV, MacBook Pro, etc), as I am an Apple Developer, so that might be in part why it currently works for me at all.
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